fix(v2-ingestion): harden LBA/BCL snapshot contract for public data

tests/fixtures/lba/lba_players_stats_partial_public.json

@@ -0,0 +1,25 @@
+{
+  "data": [
+    {
+      "player": {
+        "id": "p-002",
+        "name": "Andrea Bianchi"
+      },
+      "team": {
+        "id": "team-olimpia-milano",
+        "name": "Olimpia Milano"
+      },
+      "gp": 18,
+      "mpg": 24.7,
+      "ppg": 12.3,
+      "rpg": 2.9,
+      "apg": 4.2,
+      "spg": 1.1,
+      "bpg": 0.1,
+      "tov": 1.8,
+      "fg_pct": 45.0,
+      "three_pct": 35.4,
+      "ft_pct": 82.7
+    }
+  ]
+}